Pneumatic clock system.



PNEUMATIC OLOOK SYSTEM.

APPLICATION FILED SEPT. 11, 1905.

910,373. Patented Jan. 19, 1909.

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910,373. Patented Jan. 19, 1909.

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APPLIOATION FILED SEPT. 11, 1905.

910,373 Patented Jan. 19, 1909.

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APPLICATION FILED SEPT. 11, 1905. 91 0,373. Patented Jan. 19, 1909.

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AUGUSTUS L. HAHL, OF CHICAGO, ILLINOIS, ASSIGNOR TO HAHL AUTOMATIC CLOCKCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PNEUMATIC CLOCK SYSTEM.

Application filed September 11, 1905.

To all whom it may concern:

Be it known that I, AUeUsTUs L. HAHL, a citizen of the United States,residing at Chicago, county of Cook, State of Illinois, have invented acertain new and useful Improvement in Pneumatic Clock Systems, anddeclare the following to be a full, clear, and exact description of thesame, such as will enable others skilled in the art to which it pertainsto make and use the same, reference being had to the accompanyingdrawings, which form a part of this specification.

My invention relates in general to clocks, and more particularly topneumatic clock systems.

In pneumatic clock systems, such for instance as that covered by U. S.Letters Patent No. 598,066, granted to me Jan. 25, 1898, a master clockcontrols the operation of a motor for supplying and exhausting impulsesof air to and from systems of service tubes with which communicate atredetermined points air chambers actuatec both by the supply and exhaustof air impulses to operate subordinate clocks in unison with the masterclock. In my prior patent, the impulse mechanism comprises two bellowswith each of which a system of subordinate clocks communicates byservice tubes, the bellows being so connected by a lever that as one isdistended by the motor the other is compressed. The work im )osed uponthe motor at the master clock in alternately compressing the bellowsgradually increases from nothing to its maximum as each bellows iscompressed. The power of the motor is therefore necessarily suflicientlygreat to exert the force requisite to complete the com pression of thebellows, and is consequently greatly excessive at the commencement ofits operation, which results in imparting to the motor a jerking andirregular motion.

The primary object of my invention is to provide a pneumatic clocksystem of the type covered by my said prior U. S. patent, in which amotor may be employed having approximately one-half the power necessaryto exert the pressure required to complete the alternate compression ofthe bellows, thereby rendering it possible to reduce the size of themotor for a given number of clocks with a corresponding reduction in thecost of installing and operating the system, and also making theoperation of the motor more uniform.

Specification of Letters Patent.

Patented Jan. 19, 1909.

Serial No. 277,810.

A further object of my invention is to provide in a clock system adirect detent requiring much less overbalancing than a warning detent,actuated at predetermined intervals by the time train of a master clockfor releasing the motor to actuate the impulse mechanism and also foropening the valve from the service pipe containing pressure, which willimpose a minimum load upon the time train and will relieve the same fromall pressure from the motor train.

A still further object of my invention is to provide in a pneumaticclock system yieldingly seating valves, for controlling the atmosphericexhaust from the service tubes in which the pressure in the tubesassists in seating the valves.

A still further object of my invention is to provide an improvedpneumatic clock system by means of which a maximum number of clocks maybe efliciently operated at a minimum cost.

My invention will be more fully described hereinafter with reference tothe accompanying drawings in which the same is illustrated as embodiedin a convenient and practical form, and in which:

Figure 1. is a front elevational view: Fig. 2. a detail elevational viewof the tripping mech anism prior to being tripped; Fig. 3. a viewsimilar to Fig. 2 after the tripping has occurred; Fig. 4. a viewsimilar to Fig. 3. with the parts in position after closing the valve ofthe service pipe; Fig. 5. a view similar to Figs. 3 and 4, showing theparts in the position they assume immediately before the motor isstopped; Fig. 6. a plan view of the tripping mechanism; Fig. 7 asectional view on line 7-7, Fig. 5; Fig. 8. a sectional view through thevalves taken on line 88, Fig. 6; Fig. 9. a detailed view of the impulsemechanism showing the auxiliary rolling weight at the point of beingshifted to aid in the com pression of the bellows F and Fig. 10. a viewsimilar to Fig. 9 showing the auxiliary rolling weight at the point ofbeing shifted to assist in compressing the bellows F.

The same reference characters are used to designate the same parts inthe several figures of the drawings.

Reference characters A and A indicate power shafts suitably j ournaledin brackets w and 1,0 depending from supporting frame W. Mounted uponthe power shafts A and A are drums a, and a around each of which issecured a weight cord at. It will, of course, be understood that othermotive power than weights may be employed if desired. Fixed to the powershafts are gear wheels B and B which mesh with an intermediate pinion b,fixed to a shaft B. A gear wheel C is also fixed to the shaft B andmeshes with a pinion c fixed to a shaft C, the latter being suitablyjournaled in the supporting frame as at W. A gear wheel 0 is fixed uponthe shaft C and meshes with a pinion d fixed upon a shaft D. A crowngear wheel D is fixed upon the shaft D and meshes with a pinion d fixedupon a vertical staff D the latter being journalcd at its lower end in abracket o and at its upper end in a bracket 0 Fixed upon the staff D isa fly governor D A radial arm at proj ects from the staff D preferablyat a point immediately above the pinion d Projecting from the shaft D isa crank arm d to which is pivotally connected a link 0, the upper end ofthe latter being pivotally connected to a bracket secured to a lever E.The lever E is fulcrumed intermediate of its ends upon the upper end ofthe frame W. The opposite ends of the lever E are pivotally connected torods f and f respectively, by means of pins f, f, engaging holes in thelever. The lower ends of the rods are secured to bellows F and F mountedupon the upper ends of pipes F and F with which they communicate. Thepipes F and F are supported in vertical positions by blocks 7L and 7L2which are adjustable laterally between the supporting frame W and aslotted guide plate 11 secured thereto. The lower ends of the pipes Fand F communicate with service pipes H and H leading to air chamberslocated at predetermined points for actuating subordinate clocks.

Branch pipes K and K extend from the main pipes fl and H and communicatethere with by means of T-eouplings 7c and k respectively. The ends ofthe branch pipes lead to valve casings K and K supported upon the frameW Each of the valve casings is provided with a cap Zc surrounding theupper end thereof and securing thereto a coupling at the end of therespective branch pipe. Located within the valve casings are valves Land L which cooperate with valve seats to control the exhaust ports 763and leading to the atmosphere. The valves L and L are provided withdepending valve stems Z and Z which extend through the valve casings andare guided at their lower ends in brackets Z and Z Surrounding eachvalve stem is a spring Z bearing at its lower end upon a pin Z and atits upper end engaging a collar Z loosely surrounding the valve stem andlimited in its upward movement by a pin Z". Fulerumed upon a bracket toextending from the supporting frame W are valve actuating levers l and Mthe former of which 1s provided with a yoke m engaging the collar'l onthe valve stem Z, while the latter of said levers is provided with asimilar yoke for engaging the collar on the valve stem Z as clearlyshown in Fig. 8. The ends of the levers M and M are provided withcounterbalancing weights m. The valve actuating levers extend inwardlyfrom their fulcrums, and terminate above the supporting pins N and Nprojecting laterally from the opposite sides of a bracket N whichextends from the supporting frame W The levers M and M are provided withupwardly projecting cams m and m which are adapted to be engaged byrollers n and n respectively, secured to the opposite ends of a le ver Nfixed to the shaft 1).

The openin of the valves prior to the operation of the impulse mechanisminsures the air in the service pipes being at atmospheric pressure sothat the expansion or contraction of the air in the tubes owing tochanges in temperature will in no wise interfere with the properoperation of the system. If no valves were employed and the servicetubes were closed to the atmosphere a contraction of the air wouldimpose a load upon the motor in distending the bellows, while on. theother hand, the expansion of the air would increase the power necessaryto compress the bellows. The opening of each valve prior to theexpansion of the bellows communicating with the corresponding servicepipe also serves to replace any air which may have escaped owing toleakage in the system.

An oscillatory detent frame P is ournaled upon a rod 29, the oppositeends of which are mounted in bearings Q03 and w* projecting upwardlyfrom the supporting frame. The frame P is provided with an arm Pprojecting inwardly and having a lateral bent por tion which overliesthe levers M and W Extending from the frame P at the opposite side ofits fulcrum from the arm P, is a counterbalance weight p.

Pivotally supported upon the frame P is an oscillatory -member B onedownwardly extending end of which is pivotally secured to the arm P,while the other end thereof which is pivoted to the extension of p ofthe frame P, projects downwardly forming a detent lever 7 the lower endof which extends into the path of movement of a series of pins 8, 8etc., fixed upon the gear wheel S of a time train. Any suitable timetrain may be employed, such as illustrated in Fig. 1, and as theoperation of such mechanism is well known it need not be furtherdescribed in detail.

r indicates an adjustable stop, against which the detent lever rnormally rests, as shown in Fig. 1.

The member R is provided with downwardly extending hangers r and 1,which are adapted to alternately support the ends of the levers M and MThe positions of I the hangers r and r may be adjusted by means of suchscrews 7' supported in a bracket R de ended from the member R. Themember is provided with an outwardly extending arm R which serves as aweight to counterbalance the detent lever 1". Extending beneath theextension p of the oscillatory detent frame P is a supporting pin 10upon which the frame normally rests. A lever O is fulcrumed upon a shaft0 the ends of which are supported in bearings 4.0 and w projectingupwardly from the supporting frame. Extending outwardly from the shaft 0is a counterbalance weight 0 secured to the end of the lever O. Theopposite end of the lever 0 from the weight 0 is provided with a pawl O,which is adapted to alternately rest upon lugs 0 and 0 projecting fromthe levers M and M thereby supporting the lever O in position to retainthe upwardly projecting finger 0 thereon in the path of the stop arm (1which projects from the shaft D The lever O is provided with a cam 0adapted to be alternately engaged by rollers n, n, carried by the leverN at opposite sides of the shaft D.

Fulcrumed upon the upper end of the supporting frame N immediately abovethe ever E is a tube G either straight or having enlarged ends 9, andcontaining a rolling weight such as mercury, lead or any heavysubstance. An arm G is rigidly secured to and depends from the lever Gat a point adjacent its fulcrum. The lower end of the arm G extends intothe path of movement of pins g projecting inwardly from the "ear wheel0. Rigidly secured to the lever (i at a point adjacent its fulcrum is atoothed segment 1 which meshes with a toothed segment 9 pivotallysupported between the frame WV and a strap V. Rigidly secured to anddepending from the segment 9 is an arm G the lower end of which extendsinto the path of movement of pins g projecting from the gear wheel 0 atthe opposite side thereof from the pins g. The pins 9 are locatedintermediate of the pins g as clearly shown in Fig. 9. The lever G isadapted to rest upon either a support 6 in the form of a roller carriedby the lever E or upon a bracket 0 also carried by the lever E at theopposite side of its fulcrum from the roller 6.

The operation of my invention is as follows: At predetermined intervals,such for instance, as each minute, one of the pins 3, 3 etc., on thegear wheel S of the time train, engages the lower end of the detentlever r and oscillates the same sufficiently to disengage the hanger ror r from beneath the inner end of the lever M or M When the parts ofthe mechanism are in the positions indicated in Figs. 1 and 2, the valveL is closed by reason of its actuating lever M being supported by thehanger r. The system of clocks in communication with the service pipe Hhave been actuated by an impulse of air produced by the compression ofthe bellows F while the system of clocks in communication with theservice pipe H have been actuated by the return of the air to thedistended bellows F under normal conditions and also by the escape ofair through the valve L in case of chan e of temperature. A slightoscillation of t e detent lever 1" through the contact therewith of thepins 8 removes the hanger r from beneath the inner end of the lever M,thereby opening the valve L and permitting the air under pressure, to bereleased from the service pipe H. The release of pressure from theservice pipe H together with the distension of the bellows F actuatesthe air chambers at the various subordinate clocks, so that the handsthereof are moved forward one minute, or any other predetermineddistance corresponding to the master clock. The movement of the lever Mfrom its position upon the hanger r to its place of rest upon thesupporting pin N, removes the supporting lug 0 thereon from beneath thepawl O on the end of the lever 0 thereby permitting the latter to fallfrom the position shown in Fig. 2 to that shown in Fig. 3. Theoscillation of the lever 0 removes the finger 0 thereon from the path ofmovement of the arm (i on the shaft D thereby permitting the rotation ofsuch shaft and the consequent operation of the motor. The weightsthrough the supporting cords (t rotate the drums a and a which in turnrotate the power shafts A and A The gear wheels B and B fixed upon thepower shafts rotate the shaft B through their engagement with the pinionb. The rotation of the shaft B rotates therewith the gear wheel C whichin turn rotates the gear wheel 0 and the shaft 0 upon which it is fixed.The gear wheel 0 rotates with the shaft C and through the pinion d whichit engages, rotates the shaft D. The shaft D rotates the crown gear Dthereon, which meshes with the pinion d fixed up on the shaft D therebyrevolving the fly governor D The rotation of the shaft D carries theroller n on the lever N into engagement with the cam m on the lever lthereby oscillating the latter from the position shown in Fig. 3 to thatshown in Fig. 4, in which the end thereof is in position to fall uponthe hanger T when the roller n passes from beneath the cam m Theoscillation of the lever M through engagement with the arm P oscillatesthe frame P and with it the detent member R so that the hanger r isswung into position to receive the end of the lever M The oscillation ofthe frame P by the lever M lifts the detent lever 1' from engagementwith the pin 8 into position to be engaged by the following pin 8 011the time train gear wheel S. The elevation of the lever M closes thevalve L thereby cutting ofi. the communication between the service pipeH and the atmosphere, so that the compression of the bellows F theoperation of which will be subsequently described, .will force an airimpulse through such service pipe and actuate the air chambers at thevarious subordinate clocks so that the latter are moved forward thepredetermined degree, corresponding to the master clock. The continuedrotation of the shaft D moves one of the rollers it into engagement withthe cam 0 011 the lever 0 so that the latter is oscillated from theosition shown in Fig. 4 to that shown in l ig. 5, with the result thatthe pawl O is in position to fall upon the lug 0 on the lever M when theroller it passes from beneath the cam 0 The stop finger 0 on the lever Ois consequently elevated from a supporting pin 0 (see Pig. 1) into sucha position that the upper end thereof lies within the path of movementof the arm (P so that the motor will be again stopped upon the arm (Zengaging the upper end of the finger 0. The motor then continues out ofoperation until the movement of the time train oscillates the detentlever r sufiiciently to remove the hanger r from beneath the lever Mpermitting the latter to fall upon the supporting pin N The falling ofthe lever M closes the valve L", permitting the escape of the compressedair to the atmosphere from the service pipe H thereby in conjunctionwith the subsequent distention of the bellows F actuating the airchambers in communication therewith and moving the subordinate clocksforward the predetermined degree. The falling of the lever M also servesto remove the lug 0 from beneath the pawl 0, so that the lever 0 drops,upon the supporting pin 0 thereby removing the stop finger 0 from thepath of the arm (1 permitting the motor to again run. The operation ofthe motor rotates the lever N, which carries the roller a into contactwith the cam m, thereby elevating the lever M, which closes the valve Land. places the service pipe H in condition to receive the impulse ofair generated by the compression of the bellows F. The lever M isretained in its elevated position by the hanger 7', which is oscillatedbelow the same through the engagement of such lever w1th the portion Pof the detent oscillating frame P. The motor contmues to run until oneof the rollers 1t engages the cam m on the lever 0, thereby swinging thesame upwardly and projecting the stop finger 0 into the path of the arm(1 the lever being retained in such position. by the pawl 0 resting uponthe lug 0 on the lever M as shown in Fig. 2.

It will be observed that when either of the levers M or M is supportedby the corresponding hanger r or 1, it forces downwardly the yoke on thecorresponding valve stem Z or Z, thereby seating the valve L or L so asto close the corresponding branch pipe K or K from communicating withthe atmosphere through the ports 763 or lc The movable collar Z on eachvalve stem serves through the compression of the spring Z to permit theinner end of the corresponding lever to move upwardly even after thecorresponding valve has been seated, thereby permitting the inner endsof the levers to be swung upwardly in position to fall upon the hangersand insuring the valves being tightly closed after the levers have movedfrom the positions such as that of the lever M in Fig. 4, to that ofsaid lever as shown in Fig. 5.

Operation of impulse mecham'sm.l/Vhen the mechanism is in the conditionshown in Fig. 1, the release of the motor oscillates the lever E throughthe link 0 connecting the same with the crank (Z on the shaft D. Theoscillating of the lever E compresses the bellows F and distends thebellows F. The compression of the bellows F forces the air through inthe service pipe H the exhaust valve L leading therefrom having beenpreviously closed as above described, and actuates the subordinateclocks through the medium of their air chambers. It is evident that thepower required to compress the bellows gradually increases and that in aconstruction such as that covered by my prior patent above referred to,the motor must be of sufficient power to exert the requisite force tocomplete the compression of the bellows. In my present improvement,during the first part of the compression of the bellows when there is noresistance, the otherwise wasted power is utilized to oscillate the tubecontaining a rolling weight, so that the work of the motor in completingthe compression of the bellows is assisted by the weight.

The tube is oscillated at a little greater speed than the motion of thebellows lever E so that before the latter has reached a horizontalposition, at which the air resistance is rapidly increasing, theoscillating tube is tipped and the weight therein has rolled to theother end thereof and assists the power of the motor to complete thecompression of the bellows. For example, if it requires 16 ounces forthe final compression of the bellows, 9 ounces will be exerted by thepower of the motor and 7 ounces by the weight. At the commencement ofthe operation of the motor the 9 ounces exerted thereby lift up 7 ouncesof weight which acts with the motor during the latter part of itsoperation. If in actual practice it takes a weight of 100 PULlllLlS [1UUPUIUJLU Z1111. Ulllb U111) .LUUUUJ. lJU compress the bellows for acertain number of clocks, the employment of a rolling weight of poundsenables a weight of pounds to operate the system in lieu of a weight of100 pounds. The employment of a lighter weight permits a motor oflighter construction to be used with less internal friction and with aslight gain in initial force, in addition to permitting the use of aclock case of smaller size.

In Fig. 9 the impulse mechanism is illustrated as in a positionresulting from an operation of the motor sufficient to partiallycompress the bellows F and to bring a pin g on the gear wheel 0 intocontact and slightly oscillate the lower end of the arm G, the upper endof which is rigidly secured to the weight carrying tube G. The furtheroperation of the motor causes the pin 9 to move the arm G a distance tooscillate the lever from the position shown in Fig. 1, to one in whichthe weight within the tube G is supported upon the bracket 0 on thelever E. The subsequent operation of the motor is therefore performed bythe weight within the tube G and the power of the motor necessary,

to compress the bellows is correspondingly reduced. hen the bellows Fhas been compressed the initial succeeding operation of the mechanismopens the valve L thereby releasing the air in the service pipe H whilethe valve L leading from the service pipe H is closed. The operation ofthe motor through the shaft D, crank (Z and link 0 oscillates the leverE in a direction to compress the bellows F. An operation of the motorsuflicient to partially compress the bellows F, as shown in Fig. 10,brings one of the pins g 011 the gear wheel 0 into contact with the armG and oscillates the latter, which through the meshed segments g and goscillates the tube G from the position shown in Fig. 10 to that shownin Fig. 1, thereby shifting the rolling weight into position to aid themotor in completing the compression of the bellows F.

The bellows F and F may either or both be adjusted towards or away fromthe fulcrum of the lever E, thereby varying the degree of the distentionand compression of the bellows according to the number of supplementalclocks in communication with the respective service pipes H and H Suchadjustment of the bellows may be readily accomplished by removing thepins f and sliding the blocks h and 72 between the plate H and frame Vi.The clamp screws engaging the block and extending through slots in theplate H serve as convenient means for securing the blocks in any desiredposition. After the blocks have been adjusted the pins f are insertedthrough the holes in the upper ends of the rods f and f and throughcorresponding holes in the ends of the lever E.

-L'J Vvll]. UU UUDULVULL Ulla-Ill ULLU VGJLVUD J-l wuu. L seat with thepressure so that the pressure assists in securely retaining the valvesin close contact with their seats when there is pressure in the servicepipes.

By employing a direct detent in place of the usual warning detent, aminimum load is imposed upon the time train as it is only necessary thatthe detent lever should be slightly oscillated in order to remove thehanger r or r from beneath the end of the lever M or M The work ofalternately lifting the levers M and M as well as lifting the lever O isimposed upon the motor which also through the alternate engagement ofthe levers M and M with the portion P of the detent swinging frame,lil'ts the detent lever from engagement with one pin on the time trainand locates the same in position to be engaged by the succeeding pin.

From the foregoing description it will be observed that I have inventedan improved pneumatic clock system, in which the motive power requiredto run a given number of clocks is reduced approximately one half byutilizing the waste power at the beginning of the operation of the motorthrough the medium of the rolling weight to assist the motor during thelatter part of its operation when the greatest power is required inwhich a minimum load is placed upon the time train in tripping themotor; and in which the pressure in the service pipes assists theseating of the valves.

Having now fully described my invention, what I claim as new and desireto secure by Letters Patent is:

1. In a pneumatic clock system, the combination with a service pipe, ofimpulse mechanism communicating with said pipe for varying the airpressure therein operatively connected to said mechanism, a lever foractuating said mechanism, a motor connected to said lever foroscillating the same so as to cause the said mechanism to be actuated tovary the pressure in said pipe, a shifting weight, means actuated bysaid motor for shifting the center of gravity of said weightindependently of the lever and prior to the oscillation of said lever toits intermediate position, and means for applying said weight whenshifted to assist the motor in oscillating said lever.

2. 111 a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each service pipe for varyingthe air pressure therein, a lever fulcrumed intermediate of its ends andconnected to each of said mechanisms, a motor connected to said leverfor oscillating the same and thereby actuating said mechanisms toalternately vary the pressure in the service pipes, a shifting weight,means for shifting the center of gravity of said weight by the motorprior to the oscillation of said lever to its intermediate position, andmeans of applying said weight when shifted to assist the motor inoscillating said lever.

3. In a pneumatic clock system, the com bination with a service pipe, ofimpulse mechanism for varying the air pressure in said pipe, a motor foractuating said mechanism, a shifting weight connected. to said motorindependently of said mechanism so as to be lifted during the first partof the work of the motor in actuating said mech anism and assisting saidmotor in effecting more than the last half of the operation of saidmechanism.

4. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism for alternately varying the air pressure in saidpipes, a motor for actuating said mechanism, and auxiliary means forutilizing the waste power during less than the first half of the work ofthe motor to assist the motor during more than the last half of itswork.

5. In a pneumatic clock system, the combination with two service pipes,of a compressible chamber communicating with each service pipe, a motor"for alternately compressing and expanding said chambers, a Weightlifted by said motor during less than the first half of its work toassist the motor during more than the last half of its work.

6. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each service pipe for varyingthe air pressure therein, a lever fulcrumed intermediate of its ends andconnected to each of said impulse mechanisms, a motor connected to saidlever for oscillating the same and thereby actuating said mechanisms toalternately vary the pressure in the service pipes, and means operatedby said motor during the initial oscillation of said lever for assistingin more than the last half of the oscillation of said lever.

7. In a pneumatic clock system, the combination with a service pipe, ofimpulse mechanism for varying the air pressure in said pipe, a motor foractuating said mechanism, an oscillatory tube, a rolling weight Withinsaid tube, connections between said motor and said tube for causing saidtube to be oscillated during the first part of the work of the motor andindependently of said mechanism, and means for applying said. weight toassist the motor in effecting more than the last half of the actuationof said motor.

8. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each service pipe for varyingthe air pressure therein, a lever fulcrumed intermediate of its ends andconnected to each of said mechanisms, a motor connected to said leverfor oscillating the same and thereby actuating said mechanisms toalternately vary the pressure in the service pipes, a shifting weight,means for shifting said weight by the motor at a greater speed than theoscillation of said lever, during less than half of the angular movementof the lever and means for thereafter shifting said weight at the samespeed as the lever so as to, assist the motor in oscillating the lever.

9. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each service pipe for varyingthe air pressure therein, a lever fulcrumed intermediate of its ends andconnected to each of said mechanisms, a motor connected to said leverfor oscillating the same and thereby actuating said mechanisms toalternately vary the pressure in the service pipes, an oscillatory tube,a rolling weight within said tube ,means for oscillating said tube bythe motor at a greater speed than the oscillation of said lever, andmeans for applying said weight to assist the motor in oscillating saidlever.

1.0. In a pneumatic clock system, the combination with two servicepipes, of impulse mechanism communicating with each service pipe forvarying the air pressure therein, a lever fulcrumed intermediate of itsends and connected to each of said impulse mechanisms, a motor connectedto said lever for oscillating the same and thereby actuating saidmechanisms to alternately vary the pressure in the service pipes, anoscillatory weight fulcrumed in the same vertical plane as the fulcrumof said lever, means for alternately supporting said weight upon saidlever at either side of its fulcrum, and means for oscillating saidweight by the motor at a greater speed than the oscillation of saidlever.

11. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each service pipe for varyingthe air pressure therein, a lever fulcrumed intermediate of its ends andconnected. to each of said impulse mechanisms, a motor connected to saidlever for oscillating the same and thereby actuating said mechanisms toalternately vary the pres sure in the service pipes, an oscillatory tubefulcrumed in the same vertical plane as the fulcrum of said lever, arolling weight within said tube, means for supporting said tube uponsaid lever alternately at either side of its fulcrum, and means foroscillating said tube by the motor at a greater speed than theoscillation of said lever.

12. In a pneumatic clock system, the combination with a service pipe, ofa compressi ble chamber communicating with said pipe, a lever adjustablyconnected to said chamber, a supporting frame upon which said chamber ismounted, means in sliding engagement with said frame for adjusting saidchamber towards and away from the fulcrum of said lever, and a motor foroscillating said lever.

13. In a pneumatic clock system, the combination with two service pipes,of a compressible chamber communicating with each of said pipes, a leverfulcrumed intermediate and adjustably connected to said chambers, asupporting frame upon which said chambers are mounted, means in slidingengagement with said frame for adjusting said chambers towards and awayfrom the fulcrum of said lever, and a motor for oscillating said lever.

14. In a pneumatic clock system, the combination with a service pipe, ofa compressible chamber communicating with said pipe, an outwardlyseating valve controlling a port leading to the atmosphere from saidpipe, a motor for compressing and expanding said chamber, and meansoperated by said motor for seating said valve prior to compressing saidchamber and for unseating said valve prior to expanding said chamber.

15. In a pneumatic clock system, the combination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve for controlling a portleading from said pipe to the atmosphere, a lever operatively connectedto said valve for seating and unseating the same, and means actuated bysaid motor for oscillating said lever to close said valve prior tocompressing said chamber and for opening said valve prior to expandingsaid chamber.

16. In a pneumatic clock system, the comination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve for controlling a portleading from said pipe to the atmosphere, a valve stem connected to saidvalve, a lever for seating and unseating said valve, a spring interposedbetween said lever and valve stem for permitting a movement of the leverrelative to the valve stem after the valve has closed, and meansoperated by the motor for oscillating said lever to close said valve.

17. In a pneumatic clock system, the combination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve for controlling a portleading from said pipe to the atmosphere, a valve stem connected to saidvalve, a lever for seating and unseating said valve, a spring interposedbetween said lever and valve stem for permitting a movement of the leverrelative to the valve stem after the valve has closed, means operated bythe motor for os cillating said lever to close said valve, and meansoperated by a time train for oscillating said lever to open said valve.

125. In a pneumatic clocK system, we combination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve controlling a portleading from said pipe to the atmosphere, a lever operatively connectedto said valve for seating and unseating the same, means actuated by saidmotor for oscillating said lever to close the valve, an oscillatoryframe for supporting said lever in position to close said valve, and atime train for oscillating said frame thereby releasing said lever andopening the valve.

19. In a pneumatic clock system, the com bination with a service pipe,of a compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve for controlling a portleading from said pipe to the atmosphere, a lever operatively connectedto said valve for seating and unseating the same, means actuated by saidmotor for oscillating said lever to close said valve, a stop forcontrolling the operation of said motor, means for supporting said stopupon said lever in position to interrupt the operation of the motor whensaid valve is closed and to remove said stop from engagement with saidmotor when the valve is open.

20. In a pneumatic clock system, the combination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a valve for controlling a portleading from said pipe to the atmosphere, a lever operatively connectedto said valve for seating and unseating the same, means actuated by themotor for oscillating said lever to close said valve, means operated bya time train for oscillating said lever to open said valve, a stop forcontrolling the operation of said motor, means for supporting said stopupon said lever in position to interrupt the operation of said motor,and means actuated by the motor for lifting said stop into position tobe supported upon said lever.

21. In a pneumatic clock system, the com bination with a service pipe,of a compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a stop for interrupting the operation of said motor, a time train, a detent actuated by the time trainfor removing said stop from engagement with the motor, and meansactuated by the motor for locating said step in position to interruptthe operation of the motor.

22. In a pneumatic clock system, the combination with a service pipe, ofa compressible chamber communicating with said pipe, a motor forcompressing and expanding said chamber, a stop for interrupting theoperation of said motor, a time train, a detent actuated by the timetrain for removing said step from engagement with the motor, meansactuated by the motor for locating said stop in position to interruptthe operation of the motor, an oscillatory frame upon which said detentis pivoted, and means actuated by the motor for oscillating said frameand thereby locating said detent in operative relation to the timetrain.

23. In a pneumatic clock system, the com bination with a service pipe,of impulse mechanism communicating with said pipe, a motor for actuatingsaid impulse mechanism, a valve for controlling a port leading from saidpipe to the atmosphere, a lever operatively connected to said valve forseating and unseating the same, means actuated by the motor foroscillating said lever to close said valve, means operated by a timetrain for oscillating said lever to open said valve, a stop controllingthe operation of said motor, a second lever to which said stop isrigidly secured, a pawl pivoted. to said second lever adapted to restupon said first lever and support said stop in position. to interruptthe operation of said motor, and means actuated by the motor for liftingsaid second lever in position for the pawl to rest upon said firstlever.

24:. I11 a pneumatic clock system, the combination with a service pipe,of impulse mechanism communicating with said pipe, a motor for actuatingsaid mechanism, a valve controlling a port leading from said pipe to theatmosphere, a lever operatively connected to said valve for seating andunseating the same, means actuated by said motor for oscillating saidlever to close said valve, an oscillatory detent frame for supportingsaid lever in position. to close said valve, a detent lever extendingfrom said frame, a time train, pins carried by said time train tosuccessively engage said detent lever thereby oscillating said frame andreleasing said lever to open the valve.

25. In a pneumatic clock system, the combination with a service pipe, ofimpulse mechanism communicating with said pipe, a motor for actuatingsaid mechanism to vary the pressure in said pipe, a valve controlling aport leading from said pipe to the atmosphere, a lever operativelyconnected to said. valve for seating and u nseating the same, meansactuated by the motor for oscillating said lever into position to closesaid valve, oscillatory means for supporting said lever in position toclose the valve, a time train, and means actuated by the time train forswinging said oscillatory means out of engagement with said lever topermit the latter to fall and open the valve.

26. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each of said pipes, a motor foractuating said impulse mechanism to alternately vary the pressure insaid pipes, valves for controlling ports I leading to the atmospherefrom said pipes, le-

vers operatively connected to said valves for I seating and unseatingthe same, means actuated by the motor for alternately oscillatl ing saidlevers into position to close said l valves, oscillatory means foralternately supporting said levers in position to close the valves, atime train, and means actuated by the time train for swinging saidoscillatory means alternately from engagement with said levers to permitthem to fall and open the valves.

27. I11 a pneumatic clock system, the combination with a service pipe,of impulse mechanism communicating with said pipe, a motor for actuatingsaid impulse mechanism, a valve for controlling a port leading from saidpipe to the atmosphere, a lever operatively connected to said valve toopen and close the same,;means actuated by the motor for lifting saidlever in position to close said valve, an oscillatory frame forsupporting said lever in position to close said valve, a detent leverconnected to said oscillatory means, a time train, pins carried by saidtime train adapted to successively engage and oscillate said detentlever, and means actuated by said motor for locating said detent leverin position to be engaged by the successive pin.

28. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism communicating with each pipe, a motor for actuatingsaid mechanism to alternately vary the pressure in said pipes, valvesfor controlling ports leading from said pipes to the atmosphere, leversoperatively connected to said valves for opening and closing the same,means actuated by the motor for alternately lifting said levers intoposition to close said valves, an oscillatory frame for alternatelysupporting said levers in position to close said valves, a detent leverconnected to said frame, a time train, pins carried by said time trainadapted to successively engage and oscillate said detent lever, andmeans actuated by said motor for locating said detent lever in positionto be engaged by the successive pins.

29. In a pneumatic clock system, the combination with two service pipes,of impulse mechanism for alternately varying the pressure in said pipes,a motor for actuating said mechanism, and auxiliary means for utilizingthe waste power during a small initial portion of the work of the motorwhen effecting a variation of the pressure in either of said pipes toassist the motor in the performance of the remainder of said work.

30. In a pneumatic clock system, the combination with two service pipes,of a compressible chamber communicating with each pipe, a motor foralternately compressing and expanding said chamber, a weight lifted bysaid motor during a small initial portion UULD, allu J-J-J-UCIJJJQ LULweight to assist the motor in the performance of the remainder of saidwork.

31. In a pneumatic clock system, the combination with two service pipes,of a compressible chamber communicating with each service pipe, a leverfulcrumed intermediate its ends and connected to each of said chambers,a motor connected to said lever for oscillating the same so as toalternately com press said chambers, a shifting weight, means forshifting said weight by the motor at a greater speed than theoscillation of said lever during a small initial portion of the work bythe motor in compressing either of said chambers, and means forthereafter a plying said weight to assist the motor in t e performanceof the remainder of said work.

32. In a pneumatic clock system, the combination with two service pipes,of a device associated with each pipe for producing an impulse therein,a motor connected to said device for producing a working stroke ineither simultaneously with a return stroke in ULLL/LVLUA uuj. uw LeaningIJLAV thereby during less than half of each of said working strokes tostore up energy and thereafter to give up energy to the motor during theremainder of each of said working strokes.

33. In a pneumatic clock system, the combination with two service pipes,of a compressor connected with each of said pipes, a motor connected tosaid compressor so as to produce a working stroke in eithersimultaneously with a return stroke in the other, and auxiliary meansactuated by said motor during less than the first half of each of saidWorking strokes to store up energy for assisting the motor during theremaining portions of the said working strokes.

In testimony whereof, I sign this specification in the presence of twoWitnesses.

AUGUSTUS L. HAHL.

Witnesses GEo. L. WILKINSON, O. A. MULLEN.

